Word: urea
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Dates: during 1940-1949
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What made the industry jumpy was the sudden growth of the ammoniated tooth cleansers-and the skyrocketing sales of a newcomer in the big dental field. Amm-i-Dent, the first widely distributed tooth powder to include carbamide (urea) and dibasic ammonium phosphate (TIME, Feb. 14), had climbed, so its makers claimed, to fourth place in sales among all U.S. dentifrices, surpassed only by Colgate, Ipana and Pepsodent. Amm-i-Dent, a dentifrice supposed to head off tooth decay, had indisputably set the trade's teeth on edge...
Last fall, a field man reported to President Melvin that several dentists in his territory were excited over ammoniated dentifrices. Researchers at the University of Illinois and at Manhattan's Sydenham Hospital, testing the use of urea and dibasic ammonium phosphate to kill bacteria associated with tooth decay, had reported promising results...
Last week a nonprofit group called the Eastern Graduate Research Foundation announced a new campaign against Lactobacillus and a three-year program to test it. The new weapon is a tooth powder containing dibasic ammonium phosphate and urea (a synthetic nitrogen compound). The powder is supposed to break down tooth film, slow down growth of bacteria and neutralize the acid created by Lactobacillus. In preliminary experiments, the foundation claims, it has reduced decay as much...
...brilliant night life was forthwith blacked out. Three million-dollar establishments in the capital-the Urea, Atlantico and Copacabana-shut down...
...product developed from research begun by the U.S. Forest Products Laboratory. The impregnating material, called methylolurea, is made principally from two cheap, plentiful chemicals-urea and formaldehyde-which are synthesized from coal, air and water. In the impregnating process, wood is pressed and soaked in a methylolurea solution, which is converted by the wood's acids into hard, insoluble resins. The wood becomes brittle, but this disadvantage can be partly offset by impregnating only the outer part of the wood, leaving a resilient core...